The Tapco 20-round detachable SKS magazine is an aftermarket magazine designed for use with SKS rifles chambered in 7.62x39mm. Here are some key details about this magazine:

1. Caliber Compatibility: The magazine is designed for use with firearms chambered in 7.62x39mm, which is a popular intermediate rifle cartridge known for its use in rifles like the SKS and AK-47.
2. Capacity: The magazine has a capacity of 20 rounds, which is a significant increase in ammunition capacity compared to the standard internal magazine of most SKS rifles, which typically holds 10 rounds.
3. Construction: Tapco magazines are typically made of durable polymer material. Polymer magazines are lightweight, resistant to rust, and can be more affordable than metal magazines. They are known for reliable feeding and durability.
4. Compatibility: The magazine is designed specifically for use with SKS rifles chambered in 7.62x39mm. It may not be compatible with other firearms or those chambered in different calibers.
5. Installation: To use the Tapco 20-round SKS magazine, you may need to modify your SKS rifle to accept detachable magazines. This modification often involves removing the internal fixed magazine and attaching a new magazine well or adapter to the rifle. Installation should be done carefully and may require gunsmithing skills.
6. Availability: Aftermarket magazines like the Tapco 20-round SKS magazine are generally available through reputable firearms accessories retailers or online vendors that specialize in firearm accessories.
7. Legal Considerations: Always be aware of and comply with local, state, and federal laws and regulations regarding magazine capacity and firearm modifications. Laws governing magazine capacity and detachable magazines can vary by location, so it’s essential to understand and adhere to local laws.

The Tapco 20-round detachable SKS magazine is a popular accessory for SKS rifle owners who want to increase the ammunition capacity of their rifles. However, it’s important to ensure that you are compliant with local laws and have the necessary modifications in place to use detachable magazines with your SKS rifle.